Last week we removed 2 fixed window frames (they were actually casement sashes but screwed shut). New cedar single hung sash windows installed. Directed to keep the internal aves and bullnose which makes it tricky. The original windows were 110 wide, our sashes need to slide past one another so are 140mm deep. this means a lot of on site cuts and trims to make it all work (and they had plantation shutters we had to use – which we took off after first fitting so they could paint).